#include<stdio.h>

int even( int n )
{
    if (n<0)
    {
        n = -n;
    }
    
    if (n ==0)
    {
        return 1;
    }
    else if (n%2 == 0)
    {
        return 1;
    }
    else if (n%2 == 1)
    {
        return 0;
    }
    
        
}

int main(){    
    int n;    scanf("%d", &n);    if (even(n))        printf("%d is even.\n", n);      else
        printf("%d is odd.\n", n);   //奇数    return 0;
}
